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annotate pkg/common/delta.go @ 5688:6281c18b109f sr-v2

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Finsh serializing v2 meshes.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Mon, 12 Feb 2024 02:27:41 +0100
parents
children 9e9cedae718a
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5688
6281c18b109f Finsh serializing v2 meshes.
Sascha L. Teichmann <sascha.teichmann@intevation.de>
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1 // This is Free Software under GNU Affero General Public License v >= 3.0
6281c18b109f Finsh serializing v2 meshes.
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2 // without warranty, see README.md and license for details.
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3 //
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4 // SPDX-License-Identifier: AGPL-3.0-or-later
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5 // License-Filename: LICENSES/AGPL-3.0.txt
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6 //
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7 // Copyright (C) 2024 by via donau
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8 // – Österreichische Wasserstraßen-Gesellschaft mbH
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9 // Software engineering by Intevation GmbH
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10 //
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11 // Author(s):
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12 // * Sascha L. Teichmann <sascha.teichmann@intevation.de>
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13
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14 package common
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15
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16 // Delta returns a function which returns its argument when called
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17 // the first time and the delta to the last call afterwards.
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18 func Delta() func(int64) int64 {
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19 var last int64
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20 first := true
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21 return func(x int64) (y int64) {
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22 if first {
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23 first = false
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24 y = x
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25 last = x
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26 } else {
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27 y = x - last
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28 last = x
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29 }
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30 return
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31 }
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32 }